Synchronous motor control device, electric motor vehicle control device and method of controlling synchronous motor
First Claim
1. A device for controlling a synchronous motor, comprising:
- an inverter which drives said synchronous motor; and
a controller which detects a magnetic pole position of said synchronous motor based on a variation of a motor current when said synchronous motor is put in a short circuited state, and outputs a control signal to control said synchronous motor based on the detected magnetic pole position;
wherein said inverter controls said synchronous motor based on the control signal; and
detection of the magnetic pole position by said controller is effected under a condition when said synchronous motor is controlled by said inverter.
0 Assignments
0 Petitions
Accused Products
Abstract
A synchronous motor control system includes a synchronous motor 1, an inverter 3 and a controller 4 wherein a current differential detecting unit 13 detects a variation of a motor current when the three phases of the motor 1 is short circuited by the inverter 3, namely at the moment when a carrier wave in a PWM signal generator 9 assumes maximum or minimum value, in a calculating unit 14 a phase γ from α axis of a stationary coordinate system to a three phase short circuited current differential vector is calculated, a phase δ is estimated from d axis to the three phase short circuited current differential vector by making use of d axis current id and q axis current iq on d-q axes coordinate system in the controller 4, thereafter the magnetic pole position θ with respect to α axis is calculated from the phases γ and δ, based on thus calculated magnetic pole position θ, d-q axes control units 11, 7 and 8 are constituted to control the synchronous motor, thereby a highly reliable control system for the motor which permits a detection of the magnetic pole position without affecting a state of applied voltage thereto while performing a usual PWM control with a low cost controller.
-
Citations
49 Claims
-
1. A device for controlling a synchronous motor, comprising:
-
an inverter which drives said synchronous motor; and
a controller which detects a magnetic pole position of said synchronous motor based on a variation of a motor current when said synchronous motor is put in a short circuited state, and outputs a control signal to control said synchronous motor based on the detected magnetic pole position;
whereinsaid inverter controls said synchronous motor based on the control signal; and
detection of the magnetic pole position by said controller is effected under a condition when said synchronous motor is controlled by said inverter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A device for controlling a synchronous motor control device comprising:
-
an inverter which drives said synchronous motor; and
a controller which detects a magnetic pole position of said synchronous motor based on a variation direction of a motor current when said synchronous motor is put in a short circuited state, and generates a control signal to control said synchronous motor based on the detected magnetic pole position;
whereinsaid inverter controls said synchronous motor based on the control signal; and
detection of the magnetic pole position by said controller is effected under a condition when said synchronous motor is controlled by said inverter. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A device for controlling a synchronous motor control device comprising:
-
an inverter which drives said synchronous motor and a controller which generates a control signal, wherein said inverter drives said synchronous motor based on the control signal generated by said controller; and
said controller which detects a variation direction of a motor current when said synchronous motor is in a short circuited state under control by said inverter, sets a d-q axes coordinate system while assuming the magnetic flux direction of a rotor of said synchronous motor as d axis and an axis orthogonal to the d axis as q axis, detects a d axis current and a q axis current on the d-q axes coordinate system, calculates the magnetic pole position of said synchronous motor based on the detected variation direction of the motor current, the detected d axis current and the detected q axis current and generates the control signal depending on the calculated magnetic pole position. - View Dependent Claims (16, 17, 18, 19, 20)
-
-
21. A device for controlling a synchronous motor comprising:
-
a magnetic pole position detector which detects a magnetic pole position of said synchronous motor;
a controller which controls said synchronous motor depending on the magnetic pole position detected by said magnetic pole position detector; and
an inverter which drives said synchronous motor based on a signal from said controller, wherein said controller determines the magnetic pole position of said synchronous motor based on a variation amount or a variation direction of a motor current when said synchronous motor is placed in a short circuited state under control by said inverter, and detects an abnormality in said magnetic pole position detector or the controller through comparison of the magnetic pole position detected by the magnetic pole position detector with the magnetic pole position obtained from the variation amount or the variation direction of the motor current. - View Dependent Claims (22)
-
-
23. An electric motor vehicle control device comprising:
-
a synchronous motor which drives the electric motor vehicle;
a magnetic pole position detector which detects a magnetic pole position of said synchronous motor;
a controller which controls said synchronous motor depending on the magnetic pole position detected by said magnetic pole position detector; and
an inverter which drives said synchronous motor based on a signal from said controller, wherein said controller determines the magnetic pole position of said synchronous motor based on a variation amount or a variation direction of a motor current when said synchronous motor is placed in a short circuited state under control by said inverter, and detects an abnormality in said magnetic pole position detector or the controller through comparison of the magnetic pole position detected by the magnetic pole position detector with the magnetic pole position obtained from the variation amount or the variation direction of the motor current. - View Dependent Claims (24, 25)
-
-
26. A synchronous motor comprising:
-
a controller; and
an inverter which drives said synchronous motor based on an output from said controller;
wherein said controller includes a first detector unit which detects a magnetic pole position of said synchronous motor based on a variation amount or a variation direction of a motor current when said synchronous motor is in a short circuited state under control by said inverter, and a control unit which generates an output based on the detected magnetic pole position, and further includes a second detector unit which detects a magnetic pole position at the time when a rotating speed of said synchronous motor is in a predetermined low range including a rotation stoppage state, wherein said controller controls the synchronous motor based on an output from said second detector unit when a rotating speed of said synchronous motor is in a predetermined low range including a rotation stoppage state and controls based on an output from said direct detector unit when a rotating speed of said synchronous motor is in a range larger than the predetermined low range. - View Dependent Claims (27, 28, 29, 30, 31)
-
-
32. An electric motor vehicle control device having a synchronous motor, comprising:
-
a controller; and
an inverter which drives said synchronous motor based on an output from said controller;
wherein said controller includes a first detector unit which detects a magnetic pole position of said synchronous motor based on a variation amount or a variation direction of a motor current when said synchronous motor is in a short circuited state under control by said inverter, and a control unit which generates an output based on the detected magnetic pole position, and further includes a second detector unit which detects a magnetic pole position at the time when a rotating speed of said synchronous motor is in a predetermined low range including a rotation stoppage state, wherein said controller controls the synchronous motor based on an output from said second detector unit when a rotating speed of said synchronous motor is in a predetermined low range including a rotation stoppage state and controls based on an output from said first detector unit when a rotating speed of said synchronous motor is in a range larger than the predetermined low range. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
-
-
47. The electric motor vehicle control device having a synchronous motor, comprising:
-
a controller; and
an inverter which drives said synchronous motor based on an output from said controller;
wherein said controller includes a first detector unit which detects a magnetic pole position of said synchronous motor based on a variation amount or a variation direction of a motor current when said synchronous motor is in a short circuited state under control by said inverter, and a control unit which generates an output based on the detected magnetic pole position, and further includes a second detector unit which detects a magnetic pole position at the time when a rotating speed of said synchronous motor is in a predetermined low range including a rotation stoppage state, wherein said controller controls the synchronous motor based on an output from said second detector unit when a rotating speed of said synchronous motor is in a predetermined low range including a rotation stoppage state and controls based on an output from said first detector unit when a rotating speed of said synchronous motor is in a range larger than the predetermined low range; and
further comprisinga mechanism which prevents rotation of said synchronous motor, wherein when the rotation of said synchronous motor is prevented by said mechanism, a current based on an output current from said second detector unit is supplied to said synchronous motor. - View Dependent Claims (48, 49)
-
Specification